Valve-seat reamer



'- M 29,1924. JrJ- MGUCKIN VALVE SEATVREAMER Filed Nov. 26. 1921 INVENTOR W; Z1 5% ATTORNEY Patented July 29, 1924.

1}; mm; mains; JOHN J'. MCGUQKIN, OF BfiOOKLYN, NEW YORK.

VALVE-SEAT REAIVIER.

Application filed November 26, 1921. Serial No. 517,944.

To all whom it may concern:

Be it known that I, JOHN J. MoGUoKIN, a citizen of the United States, residing at Brooklyn, Kings County, New York, have invented certain new and useful Improvements in Valve-Seat Reamers, of which the following is a specification.

My invention relates to that class of reamers which are intended to ream out the valve-seats of internal combustion engines, for instance of automobile engines. And my improvements are directed to means where-' by a single reamer is adapted to operate upon valve-seats of different sizes, so that the work which it has heretofore required a number of-reamers to perform, may be accomplished by the use of a single tool.

In the drawings, Fig. 1 is an elevation of my improved tool, showing it in an operative position in a port section of an internal combustion engine; Fig. 2 is a vertical sectional view of the same tool on a larger scale, the top of the tool being broken away; and Fig. 8 is a vertical sectional view of a modification.

In all the figures similar parts are designated by similar reference numerals.

The shank of the body 1 if the tool is preferably cylindrical in form, and is provided with suitable means, for instance a screw thread 2, whereby it may be detachably screwed to a cutter head 3, which is provided with a complementary screw thread 4.

The shank 1 is also provided with a centrally disposed bore 5, in which slides a pilot 6, the movement of which is limited by suitable means, as, for instance, a shoulder 15 adapted to be arrested by a shoulder 16 in the cutter head; or a in 7 sliding in a slot 8 in the shank 1; and the pilot being kept to duty by a coiled spring 9, housed in the bore 5 above the pilot- The shank 1 is provided with suitable means by which it may be grasped for the purpose of rotation, as for instance with a transverse hole through ,which a suitable rod 10 may be applied. This rod holds down the spring 9.

The lower end of the pilot 6 is, preferably, tapered as at 11; although for the taper a series of steps 1212 may be substituted, as shown in the modification of Fig. 3. The

taper, or series of steps, is intended to cooperate with the va-lve-stem bore 13 in the engine casing, so that in the smaller makes of engine, the smaller ortion, only, of the pilot will enter the va ve-stem bore, while in the larger makes of engine the larger portion of the pilot will be seated in the valve-stem bore.

The cutter head 3 is made of suflicient thickness to permit it to operate successfully on valve-seats of several diiferent sizes, the smaller valve-seat being reamed by a smaller portion of the cutter head, and the cutter head passing further and further into the seats as their sizes increase.

It will be seen, therefore, that when my improved tool is placed into an engine, as shown in Fig. 1, its pilot end 11 will seat itself in the valve-stem bore 13, while the cutter head 3 will accommodate itself to the valve-seat 14:, the spring 5 allowing the pilot 6 to be pushed up: into the shank of the tool against the tension of the spring 9, so that both the pilot and the cutter head may accommodate themselves to their respective complementary bearings; spring 9 also allowing the pilot to slide still further up in the handle, as the head 3 cuts down into the valve-seat.

By these means, it will be seen, that my improved tool will accommodate itself to valve-seats and valve-stem bores of different diameters and of different relative, vertical, distances, so that the single tool may be uti lized for reaming out the valve-seats of engines oil-different sizes.

I desire to point out also that details in construction of my device may be modified, as by the substitution of mechanical equivalents, without departing from the spirit and scope of my invention as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States, is

1. In a valve-seat reamer, the combination of a shank, a cutter, an adjustable pilot housed within the cutter, and means for yieldably projecting the pilot.

2. In a valve-seat reamer, the combination in a 'unitary structure of a shank, a rigid cutter head adapted to operatively engage with any of a plurality of valve-seats of different diameters, and an adjustable pilot the adapted to operatively seat itself in any of of different diameters, means for revolving a plurality of valve stem bores of different such element, and centering means, adapted diameters corresponding respectively With to cooperate with any of a pluralityof 10 the different valve-seats. valve stem bores of difierent diameters cor- 3. In a valve-seat reamer, a unitary strucresponding respectively with the different ture embodying a rigid element adapted to valve-seats.

ream out any of a plurality of valve seats 7 JOHN J. MOGUCKIN. 

